condition mean min max ZT0-3 24.1 24.1 24.1 ZT4-7 1.7 1.7 1.7 ZT8-11 14.1 14.1 14.1 ZT12-15 4.6 4.6 4.6 ZT16-19 23.75 23.75 23.75 ZT20-23 6.45 6.45 6.45